I just bought a pre-owned 2008 XC70. How would I know if my car has the Collision Warning with auto brake option (aka pre-crash system) ? I have a hissing vacuum leak brake booster that I need to replace and I want to make sure I get the right replacement booster. I guess if I don't see a camera in my visor area then I don't have it. My choices are a booster with pre-crash system and without asbestos brakes and a booster without pre crash system with asbestos brakes. What difference do asbestos brake pads make?

there appears to be two groupings of brake boosters for XC70 cars w/o collision brake assist, those with asbestos brake pads and those without asbestos brake pads. Does anyone know why there is a difference based on asbestos pads?